Köstenberger:
[3:14-15]
The allusion to Moses lifting up the serpent in the wilderness is plainly to Num. 21 :8-9, where God is shown to send poisonous snakes to judge rebellious Israel. When Moses intercedes for his people, God provides a way of salvation in the form of a raised bronze serpent, so that “when anyone was bitten by a snake and looked at the bronze snake, he lived.” But the primary analogy established in the present passage is not that of the raised bronze serpent and the lifted-up Son of Man; rather, Jesus likens the restoration of people’s physical lives as a result of looking at the bronze serpent to people’s reception of eternal life as a result of “looking” in faith at the Son of Man (d. 3:15-18; see Barrett 1978: 214; cf. Carson 1991: 202). Yet as in the case of wilderness Israel, the source of salvation ultimately is not a person’s faith, but the God in whom the faith is placed (d. Wis. 16:6-7). “Lifted up” (hypsothenai, hypsothenai) has a double meaning here (d. 8:28; 12:32,34), linking Jesus’ exaltation with his elevation on a cross (Ridderbos 1997: 136-37). The expression draws on Isa. 52: 13 LXX (hypsothesetai, hypsothesetai; see Dodd 1953: 247).
The phrase “everyone who believes” strikes a markedly universal note. Although looking at the bronze serpent in the wilderness restored life to believing Israelites, there are no such ethnic restrictions on believing in Jesus. Everyone who believes will, “in him” (Jesus; see additional note), receive eternal life (cf. 3: 16-18; see commentary at 1:4,9, 12).42 God sent Jesus to save not just Israel, but the entire world (3:17). Its insistence on the universality of the Christian message marks John’s Gospel off from sects such as the Qumran community or the large number of mystery religions, all of which saw salvation limited to a select few. At the same time, however, John’s Gospel does not teach universalism, that is, the notion that all will eventually be saved; rather, salvation is made contingent on believing “in him” (3: 16), that is, Jesus the Messiah (d. 20:30-31). This, then, is the answer to Nicodemus’s query in 3:9: these things (regeneration, entering the kingdom) can happen only through the “lifting up” of the Son of Man (Carson 1991: 202). The signs-based faith of 2:23 and 3:2 was founded on seeing Jesus in the flesh; the faith of 3:15 “is faith in the power of him who is powerless in the flesh and in the eyes of the flesh” (Ridderbos 1997: 137).
iii. The Evangelist’s Exposition (3:16-21)
3:16
What is the reason (gar [gar, for]) that God made eternal life available (Wallace 1996: 668)? It is his love for the world. This much-loved verse is the only place in John where God the Father is said to love the world (d. 1 John 4:9-10). The OT makes abundantly clear that God loves all that he has made, especially his people (e .g., Exod. 34:6-7; Deut. 7:7-8; Hos. 11:1-4,8-11). In these last days, God has demonstrated his love for the world through the gift of his one-of-a-kind Son. Significantly, God’s love extends not merely to Israel, but to “the world” (Morris 1995: 203; cf. Muller, ISBE 4: 1115; Guhrt, NIDNTT 1:525-26), that is, sinful humanity (Carson 1991: 205). Just as God’s love encompasses the entire world, so Jesus made atonement for the sins of the whole world (1 John 2:2).